Novel combined crankshaft mechanism of small aviation piston engine

Abstract

The invention discloses a novel combined crankshaft mechanism of a small aviation piston engine. The novel combined crankshaft mechanism comprises a front-section crank throw unit, a rear-section crank throw unit, a butt joint cover and a bearing component, wherein the two crank throw units have a similar structure and are mutually subjected to butt joint; the two crank throw units are subjected to butt joint fixing through an inner ring of the butt joint cover; the bearing component arranged on an outer ring of the butt joint cover is taken as a middle main shaft support; each crank throw unit comprises three cranks and two connecting rod shaft paths, wherein each crank is rectangular, two ends of each crank are of a circular arc shape, the cranks are arranged in parallel, and are fixedly connected through the connecting rod shaft paths which are mutually in parallel, and the axis of each connecting rod shaft paths and the corresponding crank are mutually vertical; the two crank throw units are far away from the outer side wall of the crank on the outermost side on a butt joint position; a front and rear end main shaft diameter and a front and rear end cone shaft diameter are respectively outwards arranged along the axis of the main shaft in sequence; the end surface of the cone shaft diameter is respectively provided with an inner threaded hole for fastening an outer connecting piece. The novel combined crankshaft mechanism of the small aviation piston engine has the advantages of simple and compact structure and reasonability in arrangement, the integral rigidity and strength of the crank is improved, and product reliability is effectively improved.

Description

technical field [0001] The invention relates to the technical field of piston engines, in particular to a novel combined crankshaft mechanism of a small aviation piston engine. Background technique [0002] The crankshaft is one of the key moving parts of the small piston aero-engine. Its structure and size parameters not only affect the weight and size of the engine, but also play a key role in the reliability and service life of the engine. Piston-type aero-engines not only require high liter power, but also high power-to-weight ratio. When applied to crankshafts, it is to reduce weight and shorten length while increasing specific strength, enhancing rigidity and durability. In the structural improvement of engines, crankshafts improvements play an important role. [0003] The Chinese patent document of publication number CN105065427A has announced a kind of novel crankshaft for engine, although this crankshaft also is non-full supporting structure, has effectively shorte...

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Problems solved by technology

[0005] The technical problem solved by the present invention is: in view of the limitations of the prior art, when developing a new type of horizontally opposed small piston aeroengine, the present invention provides a small aeroengine for power-to-weight ratio and volume requirements. The new type combined crankshaft mechanism of piston engine aims to provide a combination type with compact structure, short length, high strength, good rigidity, sufficient support, light weight, good manufacturability and high reliability for the newly developed small aviation piston engine. crankshaft mechanism

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